/*      $OpenBSD: qcpmic.c,v 1.3 2025/01/03 14:13:55 kettenis Exp $     */
/*
 * Copyright (c) 2022 Patrick Wildt <patrick@blueri.se>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/timeout.h>

#include <machine/bus.h>
#include <machine/fdt.h>

#include <dev/fdt/spmivar.h>

#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>

/* PMIC Registers. */
#define PMIC_REV2       0x101
#define PMIC_REV3       0x102
#define PMIC_REV4       0x103
#define PMIC_TYPE       0x104
#define  PMIC_TYPE_VAL          0x51
#define PMIC_SUBTYPE    0x105
#define PMIC_FAB_ID     0x1f2

struct qcpmic_softc {
        struct device           sc_dev;
        int                     sc_node;

        spmi_tag_t              sc_tag;
        int8_t                  sc_sid;

        void                    *sc_ih;

        struct timeout          sc_tick;
};

int     qcpmic_match(struct device *, void *, void *);
void    qcpmic_attach(struct device *, struct device *, void *);

const struct cfattach qcpmic_ca = {
        sizeof(struct qcpmic_softc), qcpmic_match, qcpmic_attach
};

struct cfdriver qcpmic_cd = {
        NULL, "qcpmic", DV_DULL
};

uint8_t qcpmic_read(struct qcpmic_softc *, uint16_t);

int
qcpmic_match(struct device *parent, void *match, void *aux)
{
        struct spmi_attach_args *saa = aux;

        return OF_is_compatible(saa->sa_node, "qcom,spmi-pmic");
}

void
qcpmic_attach(struct device *parent, struct device *self, void *aux)
{
        struct spmi_attach_args *saa = aux;
        struct qcpmic_softc *sc = (struct qcpmic_softc *)self;
        struct spmi_attach_args sa;
        char name[32];
        int node;

        sc->sc_node = saa->sa_node;
        sc->sc_tag = saa->sa_tag;
        sc->sc_sid = saa->sa_sid;

        if (qcpmic_read(sc, PMIC_TYPE) != PMIC_TYPE_VAL) {
                printf(": unknown PMIC type\n");
                return;
        }

        printf("\n");

        for (node = OF_child(saa->sa_node); node; node = OF_peer(node)) {
                memset(name, 0, sizeof(name));
                if (OF_getprop(node, "compatible", name, sizeof(name)) == -1)
                        continue;
                if (name[0] == '\0')
                        continue;

                memset(&sa, 0, sizeof(sa));
                sa.sa_tag = sc->sc_tag;
                sa.sa_sid = sc->sc_sid;
                sa.sa_name = name;
                sa.sa_node = node;
                config_found(self, &sa, NULL);
        }
}

uint8_t
qcpmic_read(struct qcpmic_softc *sc, uint16_t addr)
{
        uint8_t reg = 0;
        int err;

        err = spmi_cmd_read(sc->sc_tag, sc->sc_sid, SPMI_CMD_EXT_READL,
            addr, &reg, sizeof(reg));
        if (err)
                printf("%s: error (%u) reading 0x%x", sc->sc_dev.dv_xname,
                    err, addr);

        return reg;
}